Finding the Third Proportional to 19,860 and 42,630

Step by Step Solution

1. Step 1: Write the proportion equation
   19,860 : 42,630 = 42,630 : x
2. Step 2: Convert to fraction form
   19,860/42,630 = 42,630/x
3. Step 3: Cross multiply
   19,860x = 42,630 × 42,630
4. Step 4: Simplify right side
   19,860x = 1,817,316,900
5. Step 5: Solve for x
   x = 1,817,316,900/19,860
6. Step 6: Final answer
   x = 91,506.39